Drainage rack



FIG. 1 is a front/left/top perspective view of a dish drainer; front/right/top perspective view would be a mirror image thereof;

FIG. 2 is a rear/right/bottom perspective view thereof; a rear/left/bottom perspective view would be a mirror image thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a front elevational view thereof; and,

FIG. 5 is a left side elevational view thereof.

The broken lines depict portions that form no part of the claimed design. 

CLAIM I claim the ornamental design for a drainage rack, as shown and described. 